Advanced MathEasyArea from a width-based function
Advanced Math practice question
The function A(w) = w(w + 2) gives the area of a rectangle whose length is 2 more than its width w. What is the area when the width is 3?
Answer: 15
A(3) = 3 × 5 = 15.
Common wrong answers
- If you answered 9
- 9 is 3², ignoring the extra 2.
- If you answered 10
- 10 is 2 × 5.
- If you answered 11
- 11 adds 2 to 9.
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